Add a __has_attribute macro that works much like __has_feature and __has_builtin.
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@116906 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/clang.xcodeproj/project.pbxproj b/clang.xcodeproj/project.pbxproj
index 9c95d0a..fa1e245 100644
--- a/clang.xcodeproj/project.pbxproj
+++ b/clang.xcodeproj/project.pbxproj
@@ -2039,6 +2039,7 @@
isa = PBXProject;
buildConfigurationList = 1DEB923508733DC60010E9CD /* Build configuration list for PBXProject "clang" */;
compatibilityVersion = "Xcode 2.4";
+ developmentRegion = English;
hasScannedForEncodings = 1;
knownRegions = (
English,
diff --git a/docs/LanguageExtensions.html b/docs/LanguageExtensions.html
index 27d90c5..f27a570 100644
--- a/docs/LanguageExtensions.html
+++ b/docs/LanguageExtensions.html
@@ -136,6 +136,30 @@
<p>The feature tag is described along with the language feature below.</p>
<!-- ======================================================================= -->
+<h3 id="__has_attribute">__has_attribute</h3>
+<!-- ======================================================================= -->
+
+<p>This function-like macro takes a single identifier argument that is the name
+of an attribute. It evaluates to 1 if the attribute is supported or 0 if not. It
+can be used like this:</p>
+
+<blockquote>
+<pre>
+#ifndef __has_attribute // Optional of course.
+ #define __has_attribute(x) 0 // Compatibility with non-clang compilers.
+#endif
+
+...
+#if __has_attribute(override) || \
+#define OVERRIDE __attribute__((override))
+#else
+#define OVERRIDE
+#endif
+...
+</pre>
+</blockquote>
+
+<!-- ======================================================================= -->
<h2 id="has_include">Include File Checking Macros</h2>
<!-- ======================================================================= -->
diff --git a/include/clang/CMakeLists.txt b/include/clang/CMakeLists.txt
index e82cf42..375ae5b 100644
--- a/include/clang/CMakeLists.txt
+++ b/include/clang/CMakeLists.txt
@@ -1,4 +1,5 @@
add_subdirectory(AST)
add_subdirectory(Basic)
add_subdirectory(Driver)
+add_subdirectory(Lex)
add_subdirectory(Serialization)
diff --git a/include/clang/Lex/CMakeLists.txt b/include/clang/Lex/CMakeLists.txt
new file mode 100644
index 0000000..b823e83
--- /dev/null
+++ b/include/clang/Lex/CMakeLists.txt
@@ -0,0 +1,6 @@
+set(LLVM_TARGET_DEFINITIONS ../Basic/Attr.td)
+tablegen(AttrSpellings.inc
+ -gen-clang-attr-spelling-list
+ -I ${CMAKE_CURRENT_SOURCE_DIR}/../../)
+add_custom_target(ClangAttrSpellings
+ DEPENDS AttrSpellings.inc)
diff --git a/include/clang/Lex/Makefile b/include/clang/Lex/Makefile
new file mode 100644
index 0000000..9874bcf
--- /dev/null
+++ b/include/clang/Lex/Makefile
@@ -0,0 +1,13 @@
+CLANG_LEVEL := ../../..
+TD_SRC_DIR = $(PROJ_SRC_DIR)/../Basic
+BUILT_SOURCES = AttrSpellings.inc
+
+TABLEGEN_INC_FILES_COMMON = 1
+
+include $(CLANG_LEVEL)/Makefile
+
+$(ObjDir)/AttrSpellings.inc.tmp : $(TD_SRC_DIR)/Attr.td $(TBLGEN) \
+ $(ObjDir)/.dir
+ $(Echo) "Building Clang attribute spellings with tblgen"
+ $(Verb) $(TableGen) -gen-clang-attr-spelling-list -o $(call SYSPATH, $@) \
+ -I $(PROJ_SRC_DIR)/../../ $<
diff --git a/include/clang/Lex/Preprocessor.h b/include/clang/Lex/Preprocessor.h
index 42e2daa..1ee0fec 100644
--- a/include/clang/Lex/Preprocessor.h
+++ b/include/clang/Lex/Preprocessor.h
@@ -83,6 +83,7 @@
IdentifierInfo *Ident__VA_ARGS__; // __VA_ARGS__
IdentifierInfo *Ident__has_feature; // __has_feature
IdentifierInfo *Ident__has_builtin; // __has_builtin
+ IdentifierInfo *Ident__has_attribute; // __has_attribute
IdentifierInfo *Ident__has_include; // __has_include
IdentifierInfo *Ident__has_include_next; // __has_include_next
diff --git a/include/clang/Makefile b/include/clang/Makefile
index 030b072..d6b9844 100644
--- a/include/clang/Makefile
+++ b/include/clang/Makefile
@@ -1,5 +1,5 @@
CLANG_LEVEL := ../..
-DIRS := AST Basic Driver Serialization
+DIRS := AST Basic Driver Lex Serialization
include $(CLANG_LEVEL)/Makefile
diff --git a/lib/Lex/CMakeLists.txt b/lib/Lex/CMakeLists.txt
index 0476384..aa2c93a 100644
--- a/lib/Lex/CMakeLists.txt
+++ b/lib/Lex/CMakeLists.txt
@@ -26,4 +26,4 @@
TokenLexer.cpp
)
-add_dependencies(clangLex ClangDiagnosticLex)
+add_dependencies(clangLex ClangDiagnosticLex ClangAttrSpellings)
diff --git a/lib/Lex/PPMacroExpansion.cpp b/lib/Lex/PPMacroExpansion.cpp
index 24a0f39..19a6ca8 100644
--- a/lib/Lex/PPMacroExpansion.cpp
+++ b/lib/Lex/PPMacroExpansion.cpp
@@ -70,6 +70,7 @@
// Clang Extensions.
Ident__has_feature = RegisterBuiltinMacro(*this, "__has_feature");
Ident__has_builtin = RegisterBuiltinMacro(*this, "__has_builtin");
+ Ident__has_attribute = RegisterBuiltinMacro(*this, "__has_attribute");
Ident__has_include = RegisterBuiltinMacro(*this, "__has_include");
Ident__has_include_next = RegisterBuiltinMacro(*this, "__has_include_next");
@@ -535,6 +536,14 @@
.Default(false);
}
+/// HasAttribute - Return true if we recognize and implement the attribute
+/// specified by the given identifier.
+static bool HasAttribute(const IdentifierInfo *II) {
+ return llvm::StringSwitch<bool>(II->getName())
+#include "clang/Lex/AttrSpellings.inc"
+ .Default(false);
+}
+
/// EvaluateHasIncludeCommon - Process a '__has_include("path")'
/// or '__has_include_next("path")' expression.
/// Returns true if successful.
@@ -767,7 +776,8 @@
OS << CounterValue++;
Tok.setKind(tok::numeric_constant);
} else if (II == Ident__has_feature ||
- II == Ident__has_builtin) {
+ II == Ident__has_builtin ||
+ II == Ident__has_attribute) {
// The argument to these two builtins should be a parenthesized identifier.
SourceLocation StartLoc = Tok.getLocation();
@@ -795,7 +805,9 @@
else if (II == Ident__has_builtin) {
// Check for a builtin is trivial.
Value = FeatureII->getBuiltinID() != 0;
- } else {
+ } else if (II == Ident__has_attribute)
+ Value = HasAttribute(FeatureII);
+ else {
assert(II == Ident__has_feature && "Must be feature check");
Value = HasFeature(*this, FeatureII);
}
diff --git a/test/Lexer/has_attribute.cpp b/test/Lexer/has_attribute.cpp
new file mode 100644
index 0000000..9a58a30
--- /dev/null
+++ b/test/Lexer/has_attribute.cpp
@@ -0,0 +1,12 @@
+// RUN: %clang_cc1 -E %s -o - | FileCheck %s
+
+// CHECK: always_inline
+#if __has_attribute(always_inline)
+int always_inline();
+#endif
+
+// CHECK: no_dummy_attribute
+#if !__has_attribute(dummy_attribute)
+int no_dummy_attribute();
+#endif
+